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Old 27th October 2013, 10:01 PM   #1
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Lightbulb Diamond Differential Amplifier

Idea for full symmetrical amplifier...
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Last edited by apexaudio; 27th October 2013 at 10:29 PM.
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Old 27th October 2013, 10:16 PM   #2
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Wrong schematic?
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Old 27th October 2013, 10:29 PM   #3
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The "bias spreader" circuit is not fully symmetrical. I have attached a figure from US Patent 3,995,228, issued 30 Nov 1976 to Nelson S. Pass of Threshold Corporation. It shows a bias spreader circuit which IS fully symmetrical.
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Old 27th October 2013, 10:51 PM   #4
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Originally Posted by moschfet View Post
Wrong schematic?
This is not final schematic, if you find some mistakes...
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Old 27th October 2013, 11:04 PM   #5
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This is not final schematic, if you find some mistakes...
No, but this is not a Diamond circuit.
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Old 27th October 2013, 11:23 PM   #6
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Quote:
Originally Posted by transistormarkj View Post
The "bias spreader" circuit is not fully symmetrical. I have attached a figure from US Patent 3,995,228, issued 30 Nov 1976 to Nelson S. Pass of Threshold Corporation. It shows a bias spreader circuit which IS fully symmetrical.
I will use symmetrical bias circuit in final schematic.
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Old 27th October 2013, 11:47 PM   #7
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Maybe You can use similar topology as krell ksa 100.
Few examples bellow + diamond amp I have made recently.
For two first stages maybe it would be handy to use ccs instad of zeners supplies ?

Or idea nr 2:
-j-fet differential amps (I have used them even in ax11/sansui amp with no changes in circuit)
-bjt differential amps
-Vas
-driver
-output stage


One question, why 4 differential amps ? Two amps (as ksa100) + predriver+vas+driver+output stage should be good too.
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Last edited by borys; 27th October 2013 at 11:52 PM.
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Old 28th October 2013, 12:03 AM   #8
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Originally Posted by borys View Post
Maybe You can use similar topology as krell ksa 100.
Few examples bellow + diamond amp I have made recently...
BG3 looks like a very cool design, at least from the schematic,
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Old 28th October 2013, 06:27 AM   #9
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Thank you Apex for all you do for audio. Thanks for posting. Just a few quick ones
Are you using +-45V rails ? . I suppose diamond stands for in house name of this amplifier ?

kind regards,

Harrison.
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Last edited by OnAudio; 28th October 2013 at 06:35 AM.
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Old 28th October 2013, 07:57 AM   #10
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No, but this is not a Diamond circuit.
You are right...it's Diamond Differential circuit (Sansui), as in the title.
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